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Roof Drain Cover

One-time stamping of stainless steel trench cover, then it's more beautiful and generous than the traditional cast iron grate and steel pipe welding grate.

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1.Beautiful

One-time stamping of stainless steel trench cover, then it's more beautiful and generous than the traditional cast iron grate and steel pipe welding grate.

2.Long service life:

Stainless steel trench grate (cover) made of high quality stainless steel material selection.

3.Firm

The bottom of the product have the stainless steel cross-bar, load-bearing capacity is very good

4.Easy to clean

A new type of stainless steel trench cover light weight, very easy to remove and  free to install.

5.High strength

Strength and toughness are much higher than cast iron.

Gutters cover in China have been widely used in drainage systems in areas such as kitchens, hotels, plazas, swimming pools, municipalities, gardens, parking lots, factories, highways, terminals and airports.



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FAQ:

What's your main material?

304 and 316L stainless steel, High nickel content and corrosion-resistant.  Not rust

Then why 316 stainless steel?

GENERAL PROPERTIES – TYPE 316

Type 316 alloy is a molybdenum bearing stainless steel. It has a greater resistance to chemical attack than the 304 family. Similarly, Type 316 is durable, easy-to-fabricate, clean, weld and finish.

TYPICAL ANALYSIS – TYPE 316

Represented by ASTM-A240 and ASME SA240.

C = .08 / Mn = 2.00 / P = .04 / S = .03 / Si = 1.00 / Cr = 16.00 – 18.00 / Ni = 10.00 – 14.00 / Mo = 2.00 – 3.00

RESISTANCE TO CORROSION – TYPE 316

The addition of 2% molybdenum makes 316 considerably more resistant to corrosion and oxidation than the 304 family of alloys.

MECHANICAL PROPERTIES OF TYPE 316 AT ROOM TEMPERATURE

Typical Mechanical Properties required for annealed material covered by ASTM-A240. Yield Strength .2% offset = 30,000 / Ultimate Tensile Strength = 80,000 / Elongation = 50%. Hardness R = 90 max.

Type 316 is considerably more resistant to solutions of sulfuric acid, chlorides, bromides, iodides and fatty acids at high temperature. In the manufacture of certain pharmaceuticals, stainless steels containing molybdenum are required in order to avoid excessive metallic contamination.


STAINLESS RUST

The basic resistance of stainless steel occurs because of its ability to form a protective coating on the metal surface. This coating is a “passive” film which resists further “oxidation” or rusting. The formation of this film is instantaneous in an oxidizing atmosphere such as air, water, or other fluids that contain oxygen. Once the layer has formed, we say that the metal has become “passivated” and the oxidation or “rusting” rate will slow down to less than 0.002″ per year (0,05 mm. per year).


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